East Haven-Branford Region. 365 



contact. This sandstone occurs 180 feet above tide-water, 

 aneroid measurement. The locality is marked A on the map. 

 The strike and dip of the sandstone were not obtained here, 

 but taking the dip as 25°, which is probably not too low for 

 this region, and applying the method of calculation just given, 

 the thickness of the trap sheet at this point is about 317 feet. 

 On the same basis the second part of the ridge at the stand- 

 pipe would have the trap 260 feet thick, and the trap of the 

 first part would be about as thick. 



In the village of North Bran ford, about a mile northeast 

 from the eastern extremity of the Pond ridge, Toket (or 

 Totoket) mountain begins. This trap sheet has the same gen- 

 eral outlines as Pond Rock, but it is broader and longer and 

 rises to greater elevations. Its chord trends nearly north-north- 

 east, and is about eight miles in length. The ends of this 

 ridge, like those of the other, rise close to the crystalline rocks 

 which form the eastern boundary of the Triassic region. Only 

 the southern portion of Toket will be especially referred to in 

 the course of the present discussion. This part extends west- 

 northwest for about a mile, being nearly parallel to the eastern 

 extension of Pond Rock. It is higher than the latter and pre- 

 sents a bold, partly precipitous front to the south, while it 

 slopes away very gradually to the north. Percival's map 

 shows such a remarkable "hook" at the southern end of 

 Toket, that especial care was taken in tracing out the shape 

 of the trap, with the result given on my map, which is con- 

 firmatory of Percival's outline 



The eastern subordinate ranges. — Percival's map and descrip- 

 tion* of his "first posterior" range (the one next east of Pond 

 Rock and marked E 1, on my map), would indicate that it 

 was almost as continuous as the main ridge, but inspection of 

 the field shows that it is composed of a good many more or 

 less distinct parts. The range begins about a third of a mile 

 east-northeast from the southern end of the Pond ridge, and is 

 remarkable for the close parallelism between it and the main 

 range, not only in the principal curve but also in the subordi- 

 nate ones. At its southern end two small ridges extend north- 

 easterly. The second eastern range of trap (E. 2), begins 

 about 600 feet north of the railroad in that part of Branford 

 known as Plantsville, and extends N. 30° E. for rather more 

 than a mile, and, as has been already stated, is remarkable 

 for its convexity toward the east. The range consists of 

 seven or eight ridges, three of which are more than 100 feet 

 high, and with E 1 makes an almost complete oval. It is sep- 

 arated from the crystalline rocks by a narrow swampy valley. 



* Geology of Connecticut, p. 324. 



